refactored test name to match the required convention

Signed-off-by: Emmanuel Mireku Omari <[email protected]>

Author: 3ga01

core-java-modules/core-java-lang-math-4/src/test/java/com/baeldung/PercentageDifferenceBetweenTwoNumbersTest/PercentageDifferenceBetweenTwoNumbersTest.java

@@ -9,7 +9,7 @@
 class PercentageDifferenceBetweenTwoNumbersTest {
 
   @Test
-  void calculatePercentageDifferenceBetweenTwoNumbers() {
+  void whenCalculatePercentageDifferenceBetweenTwoNumbers_thenCorrectResult() {
     double V1 = 50.0;
     double V2 = 70.0;
     double expected = 33.33;